From 92451b4910895936cc05ce1d283644ffc44d7537 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 25 Mar 2013 18:16:11 -0500 Subject: [PATCH] libceph: no more kick_requests() race Since we no longer drop the request mutex between registering and mapping an osd request in ceph_osdc_start_request(), there is no chance of a race with kick_requests(). We can now therefore map and send the new request unconditionally (but we'll issue a warning should it ever occur). Signed-off-by: Alex Elder Reviewed-off-by: Sage Weil --- net/ceph/osd_client.c | 37 +++++++++++++++---------------------- 1 file changed, 15 insertions(+), 22 deletions(-) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index f9276cb26aa2..3723a7f16afd 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -1779,31 +1779,24 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc, down_read(&osdc->map_sem); mutex_lock(&osdc->request_mutex); - /* - * a racing kick_requests() may have sent the message for us - * while we dropped request_mutex above, so only send now if - * the request still han't been touched yet. - */ __register_request(osdc, req); - if (req->r_sent == 0) { - rc = __map_request(osdc, req, 0); - if (rc < 0) { - if (nofail) { - dout("osdc_start_request failed map, " - " will retry %lld\n", req->r_tid); - rc = 0; - } - goto out_unlock; - } - if (req->r_osd == NULL) { - dout("send_request %p no up osds in pg\n", req); - ceph_monc_request_next_osdmap(&osdc->client->monc); - } else { - __send_request(osdc, req); + WARN_ON(req->r_sent); + rc = __map_request(osdc, req, 0); + if (rc < 0) { + if (nofail) { + dout("osdc_start_request failed map, " + " will retry %lld\n", req->r_tid); + rc = 0; } - rc = 0; + goto out_unlock; } - + if (req->r_osd == NULL) { + dout("send_request %p no up osds in pg\n", req); + ceph_monc_request_next_osdmap(&osdc->client->monc); + } else { + __send_request(osdc, req); + } + rc = 0; out_unlock: mutex_unlock(&osdc->request_mutex); up_read(&osdc->map_sem); -- 2.20.1